HAZARD 4 Heavy Water Diver(TM) BlackTie: Titanium Tritium Dive-Watch - B Self-contained ever glow tritium-vial lamps; Titanium case is light, strong, and hypoallergenic; high water resistance feature set Tritium vials are not inset but 80% above the face surface; This makes them visible from the edges Not just from above Large, substantial, 50 mm high-vies design; Scratch-resistant sapphire crystal glass & crystal interior is anti-reflective coated Moisture wicking map texture under the rubber strap, combined w/ relief trench & many buckle holes keep the wrist dry What's included: Comes mounted with custom T.P.R. Band, 1x military-grade Thermoformed travel case Tritium vials are not inset but 80% above the face surface; this makes them visible from the edges not just from above Large, substantial, 50 mm high-vis design Aggressively knurled unidirectional bezel Bezel has tritium marker in &#034;12&#034; porthole Easy strap changes w/ screw-in pins; use Torx 6 screwdriver/bit to remove strap (not included)